Double-acting pump



March 4, 1930. D. H. QGOLDMANV 1,749,216

DOUBLE ACTING PUMP Filed July 19, 1928 INVENTOR.

A TTORNE Y.

Patented Mar. 4, 1930 navrn n. GOLDMAN, or CLEVELAND, 01110 DOUBLE-ACTING PUMP Application filed July 19, 1928. SerialNo. 294,016.

This invention relates to a pump unit suitable to be attached to any screw cap can or bottle which can be manufactured in quantities at low cost and which will have other desirable features hereinafter pointed out.

The single figure on the drawing herewith shows a section through a complete pump unit made in accordance to this invention assembled in a typical container. 2

Referring specifically to the drawing, a piece of tubing is used for the pump barrel 1 provided with a block 2 pressed in the lower end to provide a closure for the end of the barrel except for the valve assembly 3 which is pressed into said block 2. 1

The valve assembly .3 comprises a stamped cage 4 providing a seat for the valve ball 5 and also a retention shoulder 6 for the spring 7.

As an advantage in manufacture it will be noted that the diameter of the opening through said retention shoulder v 6 is large enough to allow for the assembly of the valve ball 5 therethrough. After the ball is inserted the spring 7 maybe threaded and snapped in position whereby a convenient and inexpensive valve assembly is produced.

The piston rod 8 consists of a piece of tubing the capacity of which has approximately twice the capacity of the space 31 between the rod and the inside of the pump barrel 1 for a reason to be explained later. The piston rod 8 is provided with a bead 9 serving as a stop for the slip washer 10, leather washers 11, separating washer 12 and clamping washer 13 which is pressed into the piston rod 8 to I 7 hold the washers in place. A valve assembly 3 is pressed into lower end of rod 8. Near the outer end of the pump barrel an internal bead 14 is formed to provide a stop for one of the two dished washers 15 between which is placed the packing 16, the end 17 of the pump barrel 1 being spun over at assembly to retain the packing. A cupped stamp1ng 18 may be pressed into theouter end of the p1ston rod 8 to close the same and the rod may be bent to form a handle 19. The discharge head 20 is a die casting cast around the pump barrel 1 containing a channel 21 connect ng the discharge port 22 in said barrel 1 with It will be seen that the valves in the nozzle the nozzle unit 23, which unit having a valve assembly 3 pressed into its inner extremity is itself pressed into the end of said chan nel 21.-

The discharge head 20 is further provided with an air relief channel 24 connecting to any air relief port 25 into the air space 26 above the liquid in the container 27. Another valve assembly 3 is pressed into the outer'end of said air relief channel 24.

The discharge head 20 is also provided with an internally threaded portion 28 adapted for attachment to said container 27, a tight jointbeing secured by packing washer 29;.

and air relief channels prevent evaporation and spilling.

In operation: Upon theupward stroke of the piston the valve 3" closes and valve 3 opens and liquid is drawn into the lower .due to the size of the chamber 31 will only hold half as much as is discharged into it from the chamber 30, the result bein that the other half must escape through the discharge port 22, channel 21, valve 3 and nozzle 23.

It will be seen from the above that a double acting pump is provided delivering a like amount of liquid during each stroke and furthermore an air pressure is secured within the hollow piston rod 8 which is active at all times while pumping and also will maintain a stream at the ends of the stroke thus avoiding dead .points. This feature makes the pump especially serviceable for use with fire extinguishing liquids, for penetrating oils, insecticides and other liquids of alike nature.

Another desirable feature is that no machining is re uired to make such a pump.

Another advantage is that the same valve assembly can be used at all points in the pump.

The invention is not limited to thespecial device shown but may be modified in various wa s within the scope of the appended claims.

claim:

1. A pump comprising a sheet metalbarrel having a valve at the foot and'a packing. v I gland at the top and an outlet openin below said gland, a head through which sai H barrel extends, saidhead havingan'outletconirnuni eating with said opening, and a tubular sh'ee metal iston rod in the arrel', having a valve at its ow'er end and extending etaits.-:;uppen.,;: end through said land and bent at its upper end to form ahan l'e'i] W g 2. A ump as in claim 1, the headhav g a V lower '1; readed extension, whereby- 'it may I be screwed on a container, and also having" nil/5i air inlet to admit a i'rf to the container-g L In testimony whereof, I do aifi-" 'my-js gn ture."

Di ifVID H. 

